FIX: Unable to download data from https://rubygems.org/ - certificate verify failed

I've used rvm for a while to manage my ruby installations and it works great. Today I've tried updating my gems with gem update and it tells me "nothing is to be updated". Eh? At least I know cocoapods is updated from my installed 0.24 to 0.26. What happened?

Then I tried to update gems manually. Firstly:

> gem install cocoapods
ERROR:  Could not find a valid gem 'cocoapods' (>= 0), here is why:
          Unable to download data from https://rubygems.org/ - SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed (https://s3.amazonaws.com/production.s3.rubygems.org/latest_specs.4.8.gz)

 Great! That's the reason. There is a long long list of the issue under https://github.com/rubygems/rubygems/issues/515

The solution suggested are:
1. use an insecure connection to rubygems.org with:

> gem update  --source http://rubygems.org

It works. But it doesn't solve the problem

2. RVM should update its certificates:

> rvm osx-ssl-certs status all
Certificates for /etc/openssl/cert.pem: Old.

> rvm osx-ssl-certs update all
Updating certificates for /etc/openssl/cert.pem: Updating certificates in '/etc/openssl/cert.pem'.
mkdir: /etc/openssl: Permission denied
Admin password required for 'mkdir -p /etc/openssl':

Then everything should be fine now.

A detailed information can be found at http://railsapps.github.io/openssl-certificate-verify-failed.html

For non-RVM and non-MAC users, here is the answer: http://stackoverflow.com/questions/19150017/ssl-error-when-installing-rubygems-unable-to-pull-data-from-https-rubygems-o


FIX: A blank view appears after QLPreviewController dismissed in iOS 7

Recently when I am working with iOS 7, I encounter the following problem: If the modalPresentationStyle of an view controller is set as UIModalPresentationFormSheet or UIModalPresentationPageSheet and after one uses the QLPreviewController once in the view controller and dismisses the Quick Look, a blank / gray view will appear on the screen instead of the presented view controller. This blank view cannot be dismissed or interacted.

That seems a serious bug in iOS 7. :(

After some days trying errors, I've found the following workaround:

in the presenting ViewController:

if ([self DeviceSystemMajorVersion] >= 7) {
modalVC.transitioningDelegate = self;
modalVC.modalPresentationStyle = UIModalPresentationCustom;
} else {
modalVC.modalPresentationStyle = UIModalPresentationFormSheet;

The function to detect iOS 7:

- (NSUInteger) DeviceSystemMajorVersion {
    static NSUInteger _deviceSystemMajorVersion = -1;
    static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
_deviceSystemMajorVersion = [[[[[UIDevice currentDevice] systemVersion] componentsSeparatedByString:@"."] objectAtIndex:0] intValue];
return _deviceSystemMajorVersion;

The presenting view controller should conform to the protocol UIViewControllerAnimatedTransitioning and UIViewControllerTransitioningDelegate, in order to use the custom transaction style that indroduced in iOS 7. Continue to add these methods:

- (id<UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented
                                                                  presentingController:(UIViewController *)presenting
                                                                      sourceController:(UIViewController *)source {
return self;
- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext {
UIView *inView = [transitionContext containerView];
    UIView *toView = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey].view;
    UIView *fromView = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey].view;
UIView *preferenceOverlay = [[UIView alloc] initWithFrame:inView.frame];
preferenceOverlay.backgroundColor = [UIColor blackColor];
preferenceOverlay.alpha = 0;
[inView addSubview:preferenceOverlay];
toView.frame = CGRectMake(0, 0, 540, 540);
toView.center = CGPointMake(CGRectGetMidX(inView.frame), CGRectGetMidY(inView.frame));
[inView addSubview:toView];
    [UIView animateKeyframesWithDuration:(1.0) delay:0 options:0 animations:^{
preferenceOverlay.alpha = 0.4;
    } completion:^(BOOL finished) {
        [transitionContext completeTransition:finished];

Then in the presented view controller:

-(void)viewWillLayoutSubviews {
[super viewWillLayoutSubviews];
if ([self DeviceSystemMajorVersion] >= 7) {
if (QLOpened) {
self.view.frame = CGRectMake(0, 0, 540, 540);
CGFloat xCenter = CGRectGetMidX(self.view.superview.frame) + 125;
CGFloat yCenter = CGRectGetMidY(self.view.superview.frame) - 125;
self.view.center = CGPointMake(xCenter, yCenter);
NSLog(@"Center X:%f Y:%f",xCenter,yCenter);

Then let the view controller to conform the protocol QLPreviewControllerDelegate and add the following method:
- (void)previewControllerWillDismiss:(QLPreviewController *)controller {
NSLog(@"QLView dismissed");
[self.view setNeedsLayout];


If you have the centering problem of the modal view controller, try fine-tuning the center point of the method viewWillLayoutSubviews